The OP's question was where to buy a checklist. Four pages and 67 posts later and the question hasn't been answered.
I disagree. By post 12, three of us had suggested that the OP obtain the genuine Cessna checklist from the POH. That checklist, combined with good airmanship, and a knowledge of any local and/or operator requirements (SOPs), would be all that is needed to operate the aircraft safely.